Here is a way to initialize defaults if a key/value are not passed to the sub. Forget where I saw this technique, possibly here.

use Data::Dumper;

sub send_2 {
    my %args = (name => 'default',
                filehandle => 'default',
                id => 'default',
                %{ +shift }
                );
                
    print Dumper \%args;
}

send_2( {name => 'Tom', id => 'IT001'} );
send_2( {name => 'Mary', filehandle => 'ARGV', id => 'foo'} );
[download]

Output is:

$VAR1 = {
          'filehandle' => 'default',
          'name' => 'Tom',
          'id' => 'IT001'
        };
$VAR1 = {
          'filehandle' => 'ARGV',
          'name' => 'Mary',
          'id' => 'foo'
        };
[download]

The sub assigns a default value (here 'default') which is overwritten if a value is passed to the sub when called.

(You could have just as easily have a default == the empty string ('') or whatever you want as a default.